85 v8 swap mounting issues

Ok I have an 85 c10 with the 4.3 v6. I took the 4.3 out and am in the process of putting a 5.7 v8 in it. I got the brackets that go from the frame to the kmember as these are different from v6 to v8. I did have to drill holes in the kmember to do it though. The mounts sit on top of that, but they are not fitting right. Does anyone know if they changed the kmember from v6 to v8 or if I am doing something wrong? I dont know what else it could be...thanks